diff --git a/testing/btest/bifs/to_count.zeek b/testing/btest/bifs/to_count.zeek
index ae90bc157a..cda4ab432c 100644
--- a/testing/btest/bifs/to_count.zeek
+++ b/testing/btest/bifs/to_count.zeek
@@ -19,9 +19,10 @@ event zeek_init()
 	print to_count("7");
 	print to_count("");
 	print to_count("-5");
-	print to_int("10101100", 2);
-	print to_int("43", 8);
-	print to_int("C3", 16);
+	print to_count("10101100", 2);
+	print to_count("43", 8);
+	print to_count("C3", 16);
+	print to_count("0xC3", 16);
 	print to_count("not a count");
 
 	local e: port = 123/tcp;
diff --git a/testing/btest/bifs/to_int.zeek b/testing/btest/bifs/to_int.zeek
index 42dea4f619..c8df54eefc 100644
--- a/testing/btest/bifs/to_int.zeek
+++ b/testing/btest/bifs/to_int.zeek
@@ -9,6 +9,7 @@ event zeek_init()
 	print to_int("10111100", 2);
 	print to_int("47", 8);
 	print to_int("F3", 16);
+	print to_int("0xF3", 16);
 	print to_int("4294967296");
 	print to_int("not an int");